Bacharach Air Filter Indicator Model MQD Part # 18-7002, NSN 6680-00-610-2529

Bacharach Air Filter Indicator Model MQD Part # 18-7002, Used 

NSN 6680-00-610-2529

The Bacharach Filter Gauge Model MQD gives a signal when air filters should be serviced

As the filter traps dirt and other airborne material, the increased air flow resistance of the filter results in a reduction in volume of air flowing through the filter and an increase in the pressure differential across the filter

When the pressure differential across the filter reaches the point at which the filter gauge has been adjusted to, the unit will signal that a filter change is needed

Filter gauge has 1/2 inch NPT connections

This is a used surplus part.